/** Copyright 2013-2020 the original author or authors from the JHipster project.
 *
 * This file is part of the JHipster project, see http://www.jhipster.tech/
 * for more information.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

class Validator {
    constructor(objectType, fieldsToCheck) {
        this.objectType = objectType;
        this.fieldsToCheck = fieldsToCheck;
    }

    validate(object) {
        if (!object) {
            throw new Error(`No ${this.objectType}.`);
        }
        checkForAbsentAttributes(this, object);
    }
}

module.exports = Validator;

function checkForAbsentAttributes(validator, object) {
    const absentAttributes = [];
    validator.fieldsToCheck.forEach(attribute => {
        if (!object[attribute]) {
            absentAttributes.push(attribute);
        }
    });
    if (absentAttributes.length !== 0) {
        const plural = absentAttributes.length > 1;
        throw new Error(
            `The ${validator.objectType} attribute${plural ? 's' : ''} ${absentAttributes.join(', ')} ${
                plural ? 'were not' : 'was not'
            } found.`
        );
    }
}
